Automatic merge from submit-queue (batch tested with PRs 61330, 64793, 64675, 65059, 65368). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

legacy api endpoints only support v1 ever

The legacy API endpoint should only ever have a v1.  This removes flexibility we don't need or want.

@kubernetes/sig-api-machinery-pr-reviews 
@sttts 

```release-note
NONE
```